______, Add the onion, celery, carrot, and garlic; cook until the onion and garlic are translucent, Stir in the chicken broth, artichoke hearts, salt, and pepper and simmer 10 minutes, Transfer mixture to a blender and puree until smooth; return the mixture to the saucepan, Squeeze one lemon half into the pan, Place the other lemon half into the saucepan, Bring to a boil, Reduce heat to low and simmer another 10 minutes, Remove the lemon half from the pan and pour in the half and half; stir, Continue to simmer until thoroughly heated, about 10 minutes,